If the primary producers of an energy pyramid produce 10 million
calories, how many calories will reach a fourth-level consumer?
a. 1.000
b. 10.000
c. 100.000
d. 1.000.000

Eutrophication caused by human nutrient pollution.

Use the distance formula to determine weather each pair of segments have the same length

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.